21534650454 has 16 divisors (see below), whose sum is σ = 43070860800. Its totient is φ = 7177956840.

The previous prime is 21534650453. The next prime is 21534650471. The reversal of 21534650454 is 45405643512.

It is a super-2 number, since 2×21534650454² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21534650453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 193647 + ... + 283845.

It is an arithmetic number, because the mean of its divisors is an integer number (2691928800).

Almost surely, 2^21534650454 is an apocalyptic number.

21534650454 is an abundant number, since it is smaller than the sum of its proper divisors (21536210346).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21534650454 is a wasteful number, since it uses less digits than its factorization.

21534650454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129995.

The product of its (nonzero) digits is 288000, while the sum is 39.

The spelling of 21534650454 in words is "twenty-one billion, five hundred thirty-four million, six hundred fifty thousand, four hundred fifty-four".